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                [Usaco2005 Jan]Moo Volume 牛的呼声                </h1>
                <p>时间限制：1s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">Farmer John has received a noise complaint from his neighbor, Farmer Bob, stating that his cows are making too much noise. FJ's N cows (1 &lt;= N &lt;= 10,000) all graze at various locations on a long one-dimensional pasture. The cows are very chatty animals. Every pair of cows simultaneously carries on a conversation (so every cow is simultaneously MOOing at all of the N-1 other cows). When cow i MOOs at cow j, the volume of this MOO must be equal to the distance between i and j, in order for j to be able to hear the MOO at all. Please help FJ compute the total volume of sound being generated by all N*(N-1) simultaneous MOOing sessions. </span></p>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;约翰的邻居鲍勃控告约翰家的牛们太会叫．</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;约翰的N(1&le;N&le;10000)只牛在一维的草场上的不同地点吃着草．她们都是些爱说闲话的奶牛，每一只同时与其他N-1只牛聊着天．一个对话的进行，需要两只牛都按照和她们间距离等大的音量吼叫，因此草场上存在着N（N-1）/2个声音．&nbsp;&nbsp;请计算这些音量的和．</span></div></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium">* Line 1: N * Lines 2..N+1: The location of each cow (in the range 0..1,000,000,000). </span></p>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第1行输入N，接下来输入N个整数，表示一只牛所在的位置．</span></div>
<p></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">* Line 1: A single integer, the total volume of all the MOOs. </span></p>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;一个整数，表示总音量．</span></div></p><hr/><h3>样例输入</h3><pre>5
1
5
3
2
4

INPUT DETAILS:

There are five cows at locations 1, 5, 3, 2, and 4.
</pre><hr/><h3>样例输出</h3><pre>40

OUTPUT DETAILS:

Cow at 1 contributes 1+2+3+4=10, cow at 5 contributes 4+3+2+1=10, cow at 3
contributes 2+1+1+2=6, cow at 2 contributes 1+1+2+3=7, and cow at 4
contributes 3+2+1+1=7.  The total volume is (10+10+6+7+7) = 40.</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Silver</p>
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